d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c67ea27d10
freebsd-nq/usr.sbin/lpr/lpd/printjob.c
Garance A Drosehn ae39ffc92e Fix checking of the "lock" file in the spool directory for a queue, 
so that the checking will wind up with the correct mode-bits in
the case where the initial open() of that lock file will create it.
Due to this bug, the first job ever sent to a queue could leave
that queue in a "printing is disabled" state.

PR:		93469
Submitted by:	Michael Szklarski of kco.com.pl
MFC after:	1 week
2006-07-07 01:12:26 +00:00

2006 lines
51 KiB
C
Raw Blame History

/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)printjob.c 8.7 (Berkeley) 5/10/95";
#endif /* not lint */
#endif
#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
__FBSDID("$FreeBSD$");
/*
* printjob -- print jobs in the queue.
*
* NOTE: the lock file is used to pass information to lpq and lprm.
* it does not need to be removed because file locks are dynamic.
*/
#include <sys/param.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <signal.h>
#include <syslog.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <time.h>
#include "lp.h"
#include "lp.local.h"
#include "pathnames.h"
#include "extern.h"
#define DORETURN 0 /* dofork should return "can't fork" error */
#define DOABORT 1 /* dofork should just die if fork() fails */
/*
* The buffer size to use when reading/writing spool files.
*/
#define SPL_BUFSIZ BUFSIZ
/*
* Error tokens
*/
#define REPRINT -2
#define ERROR -1
#define OK 0
#define FATALERR 1
#define NOACCT 2
#define FILTERERR 3
#define ACCESS 4
static dev_t fdev; /* device of file pointed to by symlink */
static ino_t fino; /* inode of file pointed to by symlink */
static FILE *cfp; /* control file */
static pid_t of_pid; /* process id of output filter, if any */
static int child; /* id of any filters */
static int job_dfcnt; /* count of datafiles in current user job */
static int lfd; /* lock file descriptor */
static int ofd; /* output filter file descriptor */
static int tfd = -1; /* output filter temp file output */
static int pfd; /* prstatic inter file descriptor */
static int prchild; /* id of pr process */
static char title[80]; /* ``pr'' title */
static char locale[80]; /* ``pr'' locale */
/* these two are set from pp->daemon_user, but only if they are needed */
static char *daemon_uname; /* set from pwd->pw_name */
static int daemon_defgid;
static char class[32]; /* classification field */
static char origin_host[MAXHOSTNAMELEN]; /* user's host machine */
/* indentation size in static characters */
static char indent[10] = "-i0";
static char jobname[100]; /* job or file name */
static char length[10] = "-l"; /* page length in lines */
static char logname[32]; /* user's login name */
static char pxlength[10] = "-y"; /* page length in pixels */
static char pxwidth[10] = "-x"; /* page width in pixels */
/* tempstderr is the filename used to catch stderr from exec-ing filters */
static char tempstderr[] = "errs.XXXXXXX";
static char width[10] = "-w"; /* page width in static characters */
#define TFILENAME "fltXXXXXX"
static char tfile[] = TFILENAME; /* file name for filter output */
static void abortpr(int _signo);
static void alarmhandler(int _signo);
static void banner(struct printer *_pp, char *_name1, char *_name2);
static int dofork(const struct printer *_pp, int _action);
static int dropit(int _c);
static int execfilter(struct printer *_pp, char *_f_cmd, char **_f_av,
int _infd, int _outfd);
static void init(struct printer *_pp);
static void openpr(const struct printer *_pp);
static void opennet(const struct printer *_pp);
static void opentty(const struct printer *_pp);
static void openrem(const struct printer *pp);
static int print(struct printer *_pp, int _format, char *_file);
static int printit(struct printer *_pp, char *_file);
static void pstatus(const struct printer *_pp, const char *_msg, ...)
__printflike(2, 3);
static char response(const struct printer *_pp);
static void scan_out(struct printer *_pp, int _scfd, char *_scsp,
int _dlm);
static char *scnline(int _key, char *_p, int _c);
static int sendfile(struct printer *_pp, int _type, char *_file,
char _format, int _copyreq);
static int sendit(struct printer *_pp, char *_file);
static void sendmail(struct printer *_pp, char *_userid, int _bombed);
static void setty(const struct printer *_pp);
static void wait4data(struct printer *_pp, const char *_dfile);
void
printjob(struct printer *pp)
{
struct stat stb;
register struct jobqueue *q, **qp;
struct jobqueue **queue;
register int i, nitems;
off_t pidoff;
pid_t printpid;
int errcnt, jobcount, statok, tempfd;
jobcount = 0;
init(pp); /* set up capabilities */
(void) write(STDOUT_FILENO, "", 1); /* ack that daemon is started */
(void) close(STDERR_FILENO); /* set up log file */
if (open(pp->log_file, O_WRONLY|O_APPEND, LOG_FILE_MODE) < 0) {
syslog(LOG_ERR, "%s: open(%s): %m", pp->printer,
pp->log_file);
(void) open(_PATH_DEVNULL, O_WRONLY);
}
setgid(getegid());
printpid = getpid(); /* for use with lprm */
setpgrp(0, printpid);
/*
* At initial lpd startup, printjob may be called with various
* signal handlers in effect. After that initial startup, any
* calls to printjob will have a *different* set of signal-handlers
* in effect. Make sure all handlers are the ones we want.
*/
signal(SIGCHLD, SIG_DFL);
signal(SIGHUP, abortpr);
signal(SIGINT, abortpr);
signal(SIGQUIT, abortpr);
signal(SIGTERM, abortpr);
/*
* uses short form file names
*/
if (chdir(pp->spool_dir) < 0) {
syslog(LOG_ERR, "%s: chdir(%s): %m", pp->printer,
pp->spool_dir);
exit(1);
}
statok = stat(pp->lock_file, &stb);
if (statok == 0 && (stb.st_mode & LFM_PRINT_DIS))
exit(0); /* printing disabled */
umask(S_IWOTH);
lfd = open(pp->lock_file, O_WRONLY|O_CREAT|O_EXLOCK|O_NONBLOCK,
LOCK_FILE_MODE);
if (lfd < 0) {
if (errno == EWOULDBLOCK) /* active daemon present */
exit(0);
syslog(LOG_ERR, "%s: open(%s): %m", pp->printer,
pp->lock_file);
exit(1);
}
/*
* If the initial call to stat() failed, then lock_file will have
* been created by open(). Update &stb to match that new file.
*/
if (statok != 0)
statok = stat(pp->lock_file, &stb);
/* turn off non-blocking mode (was turned on for lock effects only) */
if (fcntl(lfd, F_SETFL, 0) < 0) {
syslog(LOG_ERR, "%s: fcntl(%s): %m", pp->printer,
pp->lock_file);
exit(1);
}
ftruncate(lfd, 0);
/*
* write process id for others to know
*/
sprintf(line, "%u\n", printpid);
pidoff = i = strlen(line);
if (write(lfd, line, i) != i) {
syslog(LOG_ERR, "%s: write(%s): %m", pp->printer,
pp->lock_file);
exit(1);
}
/*
* search the spool directory for work and sort by queue order.
*/
if ((nitems = getq(pp, &queue)) < 0) {
syslog(LOG_ERR, "%s: can't scan %s", pp->printer,
pp->spool_dir);
exit(1);
}
if (nitems == 0) /* no work to do */
exit(0);
if (stb.st_mode & LFM_RESET_QUE) { /* reset queue flag */
if (fchmod(lfd, stb.st_mode & ~LFM_RESET_QUE) < 0)
syslog(LOG_ERR, "%s: fchmod(%s): %m", pp->printer,
pp->lock_file);
}
/* create a file which will be used to hold stderr from filters */
if ((tempfd = mkstemp(tempstderr)) == -1) {
syslog(LOG_ERR, "%s: mkstemp(%s): %m", pp->printer,
tempstderr);
exit(1);
}
if ((i = fchmod(tempfd, 0664)) == -1) {
syslog(LOG_ERR, "%s: fchmod(%s): %m", pp->printer,
tempstderr);
exit(1);
}
/* lpd doesn't need it to be open, it just needs it to exist */
close(tempfd);
openpr(pp); /* open printer or remote */
again:
/*
* we found something to do now do it --
* write the name of the current control file into the lock file
* so the spool queue program can tell what we're working on
*/
for (qp = queue; nitems--; free((char *) q)) {
q = *qp++;
if (stat(q->job_cfname, &stb) < 0)
continue;
errcnt = 0;
restart:
(void) lseek(lfd, pidoff, 0);
(void) snprintf(line, sizeof(line), "%s\n", q->job_cfname);
i = strlen(line);
if (write(lfd, line, i) != i)
syslog(LOG_ERR, "%s: write(%s): %m", pp->printer,
pp->lock_file);
if (!pp->remote)
i = printit(pp, q->job_cfname);
else
i = sendit(pp, q->job_cfname);
/*
* Check to see if we are supposed to stop printing or
* if we are to rebuild the queue.
*/
if (fstat(lfd, &stb) == 0) {
/* stop printing before starting next job? */
if (stb.st_mode & LFM_PRINT_DIS)
goto done;
/* rebuild queue (after lpc topq) */
if (stb.st_mode & LFM_RESET_QUE) {
for (free(q); nitems--; free(q))
q = *qp++;
if (fchmod(lfd, stb.st_mode & ~LFM_RESET_QUE)
< 0)
syslog(LOG_WARNING,
"%s: fchmod(%s): %m",
pp->printer, pp->lock_file);
break;
}
}
if (i == OK) /* all files of this job printed */
jobcount++;
else if (i == REPRINT && ++errcnt < 5) {
/* try reprinting the job */
syslog(LOG_INFO, "restarting %s", pp->printer);
if (of_pid > 0) {
kill(of_pid, SIGCONT); /* to be sure */
(void) close(ofd);
while ((i = wait(NULL)) > 0 && i != of_pid)
;
if (i < 0)
syslog(LOG_WARNING, "%s: after kill(of=%d), wait() returned: %m",
pp->printer, of_pid);
of_pid = 0;
}
(void) close(pfd); /* close printer */
if (ftruncate(lfd, pidoff) < 0)
syslog(LOG_WARNING, "%s: ftruncate(%s): %m",
pp->printer, pp->lock_file);
openpr(pp); /* try to reopen printer */
goto restart;
} else {
syslog(LOG_WARNING, "%s: job could not be %s (%s)",
pp->printer,
pp->remote ? "sent to remote host" : "printed",
q->job_cfname);
if (i == REPRINT) {
/* ensure we don't attempt this job again */
(void) unlink(q->job_cfname);
q->job_cfname[0] = 'd';
(void) unlink(q->job_cfname);
if (logname[0])
sendmail(pp, logname, FATALERR);
}
}
}
free(queue);
/*
* search the spool directory for more work.
*/
if ((nitems = getq(pp, &queue)) < 0) {
syslog(LOG_ERR, "%s: can't scan %s", pp->printer,
pp->spool_dir);
exit(1);
}
if (nitems == 0) { /* no more work to do */
done:
if (jobcount > 0) { /* jobs actually printed */
if (!pp->no_formfeed && !pp->tof)
(void) write(ofd, pp->form_feed,
strlen(pp->form_feed));
if (pp->trailer != NULL) /* output trailer */
(void) write(ofd, pp->trailer,
strlen(pp->trailer));
}
(void) close(ofd);
(void) wait(NULL);
(void) unlink(tempstderr);
exit(0);
}
goto again;
}
char fonts[4][50]; /* fonts for troff */
char ifonts[4][40] = {
_PATH_VFONTR,
_PATH_VFONTI,
_PATH_VFONTB,
_PATH_VFONTS,
};
/*
* The remaining part is the reading of the control file (cf)
* and performing the various actions.
*/
static int
printit(struct printer *pp, char *file)
{
register int i;
char *cp;
int bombed, didignorehdr;
bombed = OK;
didignorehdr = 0;
/*
* open control file; ignore if no longer there.
*/
if ((cfp = fopen(file, "r")) == NULL) {
syslog(LOG_INFO, "%s: fopen(%s): %m", pp->printer, file);
return (OK);
}
/*
* Reset troff fonts.
*/
for (i = 0; i < 4; i++)
strcpy(fonts[i], ifonts[i]);
sprintf(&width[2], "%ld", pp->page_width);
strcpy(indent+2, "0");
/* initialize job-specific count of datafiles processed */
job_dfcnt = 0;
/*
* read the control file for work to do
*
* file format -- first character in the line is a command
* rest of the line is the argument.
* valid commands are:
*
* S -- "stat info" for symbolic link protection
* J -- "job name" on banner page
* C -- "class name" on banner page
* L -- "literal" user's name to print on banner
* T -- "title" for pr
* H -- "host name" of machine where lpr was done
* P -- "person" user's login name
* I -- "indent" amount to indent output
* R -- laser dpi "resolution"
* f -- "file name" name of text file to print
* l -- "file name" text file with control chars
* o -- "file name" postscript file, according to
* the RFC. Here it is treated like an 'f'.
* p -- "file name" text file to print with pr(1)
* t -- "file name" troff(1) file to print
* n -- "file name" ditroff(1) file to print
* d -- "file name" dvi file to print
* g -- "file name" plot(1G) file to print
* v -- "file name" plain raster file to print
* c -- "file name" cifplot file to print
* 1 -- "R font file" for troff
* 2 -- "I font file" for troff
* 3 -- "B font file" for troff
* 4 -- "S font file" for troff
* N -- "name" of file (used by lpq)
* U -- "unlink" name of file to remove
* (after we print it. (Pass 2 only)).
* M -- "mail" to user when done printing
* Z -- "locale" for pr
*
* getline reads a line and expands tabs to blanks
*/
/* pass 1 */
while (getline(cfp))
switch (line[0]) {
case 'H':
strlcpy(origin_host, line + 1, sizeof(origin_host));
if (class[0] == '\0') {
strlcpy(class, line+1, sizeof(class));
}
continue;
case 'P':
strlcpy(logname, line + 1, sizeof(logname));
if (pp->restricted) { /* restricted */
if (getpwnam(logname) == NULL) {
bombed = NOACCT;
sendmail(pp, line+1, bombed);
goto pass2;
}
}
continue;
case 'S':
cp = line+1;
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + (*cp++ - '0');
fdev = i;
cp++;
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + (*cp++ - '0');
fino = i;
continue;
case 'J':
if (line[1] != '\0') {
strlcpy(jobname, line + 1, sizeof(jobname));
} else
strcpy(jobname, " ");
continue;
case 'C':
if (line[1] != '\0')
strlcpy(class, line + 1, sizeof(class));
else if (class[0] == '\0') {
/* XXX - why call gethostname instead of
* just strlcpy'ing local_host? */
gethostname(class, sizeof(class));
class[sizeof(class) - 1] = '\0';
}
continue;
case 'T': /* header title for pr */
strlcpy(title, line + 1, sizeof(title));
continue;
case 'L': /* identification line */
if (!pp->no_header && !pp->header_last)
banner(pp, line+1, jobname);
continue;
case '1': /* troff fonts */
case '2':
case '3':
case '4':
if (line[1] != '\0') {
strlcpy(fonts[line[0]-'1'], line + 1,
(size_t)50);
}
continue;
case 'W': /* page width */
strlcpy(width+2, line + 1, sizeof(width) - 2);
continue;
case 'I': /* indent amount */
strlcpy(indent+2, line + 1, sizeof(indent) - 2);
continue;
case 'Z': /* locale for pr */
strlcpy(locale, line + 1, sizeof(locale));
continue;
default: /* some file to print */
/* only lowercase cmd-codes include a file-to-print */
if ((line[0] < 'a') || (line[0] > 'z')) {
/* ignore any other lines */
if (lflag <= 1)
continue;
if (!didignorehdr) {
syslog(LOG_INFO, "%s: in %s :",
pp->printer, file);
didignorehdr = 1;
}
syslog(LOG_INFO, "%s: ignoring line: '%c' %s",
pp->printer, line[0], &line[1]);
continue;
}
i = print(pp, line[0], line+1);
switch (i) {
case ERROR:
if (bombed == OK)
bombed = FATALERR;
break;
case REPRINT:
(void) fclose(cfp);
return (REPRINT);
case FILTERERR:
case ACCESS:
bombed = i;
sendmail(pp, logname, bombed);
}
title[0] = '\0';
continue;
case 'N':
case 'U':
case 'M':
case 'R':
continue;
}
/* pass 2 */
pass2:
fseek(cfp, 0L, 0);
while (getline(cfp))
switch (line[0]) {
case 'L': /* identification line */
if (!pp->no_header && pp->header_last)
banner(pp, line+1, jobname);
continue;
case 'M':
if (bombed < NOACCT) /* already sent if >= NOACCT */
sendmail(pp, line+1, bombed);
continue;
case 'U':
if (strchr(line+1, '/'))
continue;
(void) unlink(line+1);
}
/*
* clean-up in case another control file exists
*/
(void) fclose(cfp);
(void) unlink(file);
return (bombed == OK ? OK : ERROR);
}
/*
* Print a file.
* Set up the chain [ PR [ | {IF, OF} ] ] or {IF, RF, TF, NF, DF, CF, VF}.
* Return -1 if a non-recoverable error occured,
* 2 if the filter detected some errors (but printed the job anyway),
* 1 if we should try to reprint this job and
* 0 if all is well.
* Note: all filters take stdin as the file, stdout as the printer,
* stderr as the log file, and must not ignore SIGINT.
*/
static int
print(struct printer *pp, int format, char *file)
{
register int n, i;
register char *prog;
int fi, fo;
FILE *fp;
char *av[15], buf[SPL_BUFSIZ];
pid_t wpid;
int p[2], retcode, stopped, wstatus, wstatus_set;
struct stat stb;
/* Make sure the entire data file has arrived. */
wait4data(pp, file);
if (lstat(file, &stb) < 0 || (fi = open(file, O_RDONLY)) < 0) {
syslog(LOG_INFO, "%s: unable to open %s ('%c' line)",
pp->printer, file, format);
return (ERROR);
}
/*
* Check to see if data file is a symbolic link. If so, it should
* still point to the same file or someone is trying to print
* something he shouldn't.
*/
if ((stb.st_mode & S_IFMT) == S_IFLNK && fstat(fi, &stb) == 0 &&
(stb.st_dev != fdev || stb.st_ino != fino))
return (ACCESS);
job_dfcnt++; /* increment datafile counter for this job */
stopped = 0; /* output filter is not stopped */
/* everything seems OK, start it up */
if (!pp->no_formfeed && !pp->tof) { /* start on a fresh page */
(void) write(ofd, pp->form_feed, strlen(pp->form_feed));
pp->tof = 1;
}
if (pp->filters[LPF_INPUT] == NULL
&& (format == 'f' || format == 'l' || format == 'o')) {
pp->tof = 0;
while ((n = read(fi, buf, SPL_BUFSIZ)) > 0)
if (write(ofd, buf, n) != n) {
(void) close(fi);
return (REPRINT);
}
(void) close(fi);
return (OK);
}
switch (format) {
case 'p': /* print file using 'pr' */
if (pp->filters[LPF_INPUT] == NULL) { /* use output filter */
prog = _PATH_PR;
i = 0;
av[i++] = "pr";
av[i++] = width;
av[i++] = length;
av[i++] = "-h";
av[i++] = *title ? title : " ";
av[i++] = "-L";
av[i++] = *locale ? locale : "C";
av[i++] = "-F";
av[i] = 0;
fo = ofd;
goto start;
}
pipe(p);
if ((prchild = dofork(pp, DORETURN)) == 0) { /* child */
dup2(fi, STDIN_FILENO); /* file is stdin */
dup2(p[1], STDOUT_FILENO); /* pipe is stdout */
closelog();
closeallfds(3);
execl(_PATH_PR, "pr", width, length,
"-h", *title ? title : " ",
"-L", *locale ? locale : "C",
"-F", (char *)0);
syslog(LOG_ERR, "cannot execl %s", _PATH_PR);
exit(2);
}
(void) close(p[1]); /* close output side */
(void) close(fi);
if (prchild < 0) {
prchild = 0;
(void) close(p[0]);
return (ERROR);
}
fi = p[0]; /* use pipe for input */
case 'f': /* print plain text file */
prog = pp->filters[LPF_INPUT];
av[1] = width;
av[2] = length;
av[3] = indent;
n = 4;
break;
case 'o': /* print postscript file */
/*
* Treat this as a "plain file with control characters", and
* assume the standard LPF_INPUT filter will recognize that
* the data is postscript and know what to do with it. These
* 'o'-file requests could come from MacOS 10.1 systems.
* (later versions of MacOS 10 will explicitly use 'l')
* A postscript file can contain binary data, which is why 'l'
* is somewhat more appropriate than 'f'.
*/
/* FALLTHROUGH */
case 'l': /* like 'f' but pass control characters */
prog = pp->filters[LPF_INPUT];
av[1] = "-c";
av[2] = width;
av[3] = length;
av[4] = indent;
n = 5;
break;
case 'r': /* print a fortran text file */
prog = pp->filters[LPF_FORTRAN];
av[1] = width;
av[2] = length;
n = 3;
break;
case 't': /* print troff output */
case 'n': /* print ditroff output */
case 'd': /* print tex output */
(void) unlink(".railmag");
if ((fo = creat(".railmag", FILMOD)) < 0) {
syslog(LOG_ERR, "%s: cannot create .railmag",
pp->printer);
(void) unlink(".railmag");
} else {
for (n = 0; n < 4; n++) {
if (fonts[n][0] != '/')
(void) write(fo, _PATH_VFONT,
sizeof(_PATH_VFONT) - 1);
(void) write(fo, fonts[n], strlen(fonts[n]));
(void) write(fo, "\n", 1);
}
(void) close(fo);
}
prog = (format == 't') ? pp->filters[LPF_TROFF]
: ((format == 'n') ? pp->filters[LPF_DITROFF]
: pp->filters[LPF_DVI]);
av[1] = pxwidth;
av[2] = pxlength;
n = 3;
break;
case 'c': /* print cifplot output */
prog = pp->filters[LPF_CIFPLOT];
av[1] = pxwidth;
av[2] = pxlength;
n = 3;
break;
case 'g': /* print plot(1G) output */
prog = pp->filters[LPF_GRAPH];
av[1] = pxwidth;
av[2] = pxlength;
n = 3;
break;
case 'v': /* print raster output */
prog = pp->filters[LPF_RASTER];
av[1] = pxwidth;
av[2] = pxlength;
n = 3;
break;
default:
(void) close(fi);
syslog(LOG_ERR, "%s: illegal format character '%c'",
pp->printer, format);
return (ERROR);
}
if (prog == NULL) {
(void) close(fi);
syslog(LOG_ERR,
"%s: no filter found in printcap for format character '%c'",
pp->printer, format);
return (ERROR);
}
if ((av[0] = strrchr(prog, '/')) != NULL)
av[0]++;
else
av[0] = prog;
av[n++] = "-n";
av[n++] = logname;
av[n++] = "-h";
av[n++] = origin_host;
av[n++] = pp->acct_file;
av[n] = 0;
fo = pfd;
if (of_pid > 0) { /* stop output filter */
write(ofd, "\031\1", 2);
while ((wpid =
wait3(&wstatus, WUNTRACED, 0)) > 0 && wpid != of_pid)
;
if (wpid < 0)
syslog(LOG_WARNING,
"%s: after stopping 'of', wait3() returned: %m",
pp->printer);
else if (!WIFSTOPPED(wstatus)) {
(void) close(fi);
syslog(LOG_WARNING, "%s: output filter died "
"(pid=%d retcode=%d termsig=%d)",
pp->printer, of_pid, WEXITSTATUS(wstatus),
WTERMSIG(wstatus));
return (REPRINT);
}
stopped++;
}
start:
if ((child = dofork(pp, DORETURN)) == 0) { /* child */
dup2(fi, STDIN_FILENO);
dup2(fo, STDOUT_FILENO);
/* setup stderr for the filter (child process)
* so it goes to our temporary errors file */
n = open(tempstderr, O_WRONLY|O_TRUNC, 0664);
if (n >= 0)
dup2(n, STDERR_FILENO);
closelog();
closeallfds(3);
execv(prog, av);
syslog(LOG_ERR, "%s: cannot execv(%s): %m", pp->printer,
prog);
exit(2);
}
(void) close(fi);
wstatus_set = 0;
if (child < 0)
retcode = 100;
else {
while ((wpid = wait(&wstatus)) > 0 && wpid != child)
;
if (wpid < 0) {
retcode = 100;
syslog(LOG_WARNING,
"%s: after execv(%s), wait() returned: %m",
pp->printer, prog);
} else {
wstatus_set = 1;
retcode = WEXITSTATUS(wstatus);
}
}
child = 0;
prchild = 0;
if (stopped) { /* restart output filter */
if (kill(of_pid, SIGCONT) < 0) {
syslog(LOG_ERR, "cannot restart output filter");
exit(1);
}
}
pp->tof = 0;
/* Copy the filter's output to "lf" logfile */
if ((fp = fopen(tempstderr, "r"))) {
while (fgets(buf, sizeof(buf), fp))
fputs(buf, stderr);
fclose(fp);
}
if (wstatus_set && !WIFEXITED(wstatus)) {
syslog(LOG_WARNING, "%s: filter '%c' terminated (termsig=%d)",
pp->printer, format, WTERMSIG(wstatus));
return (ERROR);
}
switch (retcode) {
case 0:
pp->tof = 1;
return (OK);
case 1:
return (REPRINT);
case 2:
return (ERROR);
default:
syslog(LOG_WARNING, "%s: filter '%c' exited (retcode=%d)",
pp->printer, format, retcode);
return (FILTERERR);
}
}
/*
* Send the daemon control file (cf) and any data files.
* Return -1 if a non-recoverable error occured, 1 if a recoverable error and
* 0 if all is well.
*/
static int
sendit(struct printer *pp, char *file)
{
int dfcopies, err, i;
char *cp, last[sizeof(line)];
/*
* open control file
*/
if ((cfp = fopen(file, "r")) == NULL)
return (OK);
/* initialize job-specific count of datafiles processed */
job_dfcnt = 0;
/*
* read the control file for work to do
*
* file format -- first character in the line is a command
* rest of the line is the argument.
* commands of interest are:
*
* a-z -- "file name" name of file to print
* U -- "unlink" name of file to remove
* (after we print it. (Pass 2 only)).
*/
/*
* pass 1
*/
err = OK;
while (getline(cfp)) {
again:
if (line[0] == 'S') {
cp = line+1;
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + (*cp++ - '0');
fdev = i;
cp++;
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + (*cp++ - '0');
fino = i;
} else if (line[0] == 'H') {
strlcpy(origin_host, line + 1, sizeof(origin_host));
if (class[0] == '\0') {
strlcpy(class, line + 1, sizeof(class));
}
} else if (line[0] == 'P') {
strlcpy(logname, line + 1, sizeof(logname));
if (pp->restricted) { /* restricted */
if (getpwnam(logname) == NULL) {
sendmail(pp, line+1, NOACCT);
err = ERROR;
break;
}
}
} else if (line[0] == 'I') {
strlcpy(indent+2, line + 1, sizeof(indent) - 2);
} else if (line[0] >= 'a' && line[0] <= 'z') {
dfcopies = 1;
strcpy(last, line);
while ((i = getline(cfp)) != 0) {
if (strcmp(last, line) != 0)
break;
dfcopies++;
}
switch (sendfile(pp, '\3', last+1, *last, dfcopies)) {
case OK:
if (i)
goto again;
break;
case REPRINT:
(void) fclose(cfp);
return (REPRINT);
case ACCESS:
sendmail(pp, logname, ACCESS);
case ERROR:
err = ERROR;
}
break;
}
}
if (err == OK && sendfile(pp, '\2', file, '\0', 1) > 0) {
(void) fclose(cfp);
return (REPRINT);
}
/*
* pass 2
*/
fseek(cfp, 0L, 0);
while (getline(cfp))
if (line[0] == 'U' && !strchr(line+1, '/'))
(void) unlink(line+1);
/*
* clean-up in case another control file exists
*/
(void) fclose(cfp);
(void) unlink(file);
return (err);
}
/*
* Send a data file to the remote machine and spool it.
* Return positive if we should try resending.
*/
static int
sendfile(struct printer *pp, int type, char *file, char format, int copyreq)
{
int i, amt;
struct stat stb;
char *av[15], *filtcmd;
char buf[SPL_BUFSIZ], opt_c[4], opt_h[4], opt_n[4];
int copycnt, filtstat, narg, resp, sfd, sfres, sizerr, statrc;
/* Make sure the entire data file has arrived. */
wait4data(pp, file);
statrc = lstat(file, &stb);
if (statrc < 0) {
syslog(LOG_ERR, "%s: error from lstat(%s): %m",
pp->printer, file);
return (ERROR);
}
sfd = open(file, O_RDONLY);
if (sfd < 0) {
syslog(LOG_ERR, "%s: error from open(%s,O_RDONLY): %m",
pp->printer, file);
return (ERROR);
}
/*
* Check to see if data file is a symbolic link. If so, it should
* still point to the same file or someone is trying to print something
* he shouldn't.
*/
if ((stb.st_mode & S_IFMT) == S_IFLNK && fstat(sfd, &stb) == 0 &&
(stb.st_dev != fdev || stb.st_ino != fino)) {
close(sfd);
return (ACCESS);
}
/* Everything seems OK for reading the file, now to send it */
filtcmd = NULL;
sizerr = 0;
tfd = -1;
if (type == '\3') {
/*
* Type == 3 means this is a datafile, not a control file.
* Increment the counter of data-files in this job, and
* then check for input or output filters (which are only
* applied to datafiles, not control files).
*/
job_dfcnt++;
/*
* Note that here we are filtering datafiles, one at a time,
* as they are sent to the remote machine. Here, the *only*
* difference between an input filter (`if=') and an output
* filter (`of=') is the argument list that the filter is
* started up with. Here, the output filter is executed
* for each individual file as it is sent. This is not the
* same as local print queues, where the output filter is
* started up once, and then all jobs are passed thru that
* single invocation of the output filter.
*
* Also note that a queue for a remote-machine can have an
* input filter or an output filter, but not both.
*/
if (pp->filters[LPF_INPUT]) {
filtcmd = pp->filters[LPF_INPUT];
av[0] = filtcmd;
narg = 0;
strcpy(opt_c, "-c");
strcpy(opt_h, "-h");
strcpy(opt_n, "-n");
if (format == 'l')
av[++narg] = opt_c;
av[++narg] = width;
av[++narg] = length;
av[++narg] = indent;
av[++narg] = opt_n;
av[++narg] = logname;
av[++narg] = opt_h;
av[++narg] = origin_host;
av[++narg] = pp->acct_file;
av[++narg] = NULL;
} else if (pp->filters[LPF_OUTPUT]) {
filtcmd = pp->filters[LPF_OUTPUT];
av[0] = filtcmd;
narg = 0;
av[++narg] = width;
av[++narg] = length;
av[++narg] = NULL;
}
}
if (filtcmd) {
/*
* If there is an input or output filter, we have to run
* the datafile thru that filter and store the result as
* a temporary spool file, because the protocol requires
* that we send the remote host the file-size before we
* start to send any of the data.
*/
strcpy(tfile, TFILENAME);
tfd = mkstemp(tfile);
if (tfd == -1) {
syslog(LOG_ERR, "%s: mkstemp(%s): %m", pp->printer,
TFILENAME);
sfres = ERROR;
goto return_sfres;
}
filtstat = execfilter(pp, filtcmd, av, sfd, tfd);
/* process the return-code from the filter */
switch (filtstat) {
case 0:
break;
case 1:
sfres = REPRINT;
goto return_sfres;
case 2:
sfres = ERROR;
goto return_sfres;
default:
syslog(LOG_WARNING,
"%s: filter '%c' exited (retcode=%d)",
pp->printer, format, filtstat);
sfres = FILTERERR;
goto return_sfres;
}
statrc = fstat(tfd, &stb); /* to find size of tfile */
if (statrc < 0) {
syslog(LOG_ERR,
"%s: error processing 'if', fstat(%s): %m",
pp->printer, tfile);
sfres = ERROR;
goto return_sfres;
}
close(sfd);
sfd = tfd;
lseek(sfd, 0, SEEK_SET);
}
copycnt = 0;
sendagain:
copycnt++;
if (copycnt < 2)
(void) sprintf(buf, "%c%qd %s\n", type, stb.st_size, file);
else
(void) sprintf(buf, "%c%qd %s_c%d\n", type, stb.st_size,
file, copycnt);
amt = strlen(buf);
for (i = 0; ; i++) {
if (write(pfd, buf, amt) != amt ||
(resp = response(pp)) < 0 || resp == '\1') {
sfres = REPRINT;
goto return_sfres;
} else if (resp == '\0')
break;
if (i == 0)
pstatus(pp,
"no space on remote; waiting for queue to drain");
if (i == 10)
syslog(LOG_ALERT, "%s: can't send to %s; queue full",
pp->printer, pp->remote_host);
sleep(5 * 60);
}
if (i)
pstatus(pp, "sending to %s", pp->remote_host);
/*
* XXX - we should change trstat_init()/trstat_write() to include
* the copycnt in the statistics record it may write.
*/
if (type == '\3')
trstat_init(pp, file, job_dfcnt);
for (i = 0; i < stb.st_size; i += SPL_BUFSIZ) {
amt = SPL_BUFSIZ;
if (i + amt > stb.st_size)
amt = stb.st_size - i;
if (sizerr == 0 && read(sfd, buf, amt) != amt)
sizerr = 1;
if (write(pfd, buf, amt) != amt) {
sfres = REPRINT;
goto return_sfres;
}
}
if (sizerr) {
syslog(LOG_INFO, "%s: %s: changed size", pp->printer, file);
/* tell recvjob to ignore this file */
(void) write(pfd, "\1", 1);
sfres = ERROR;
goto return_sfres;
}
if (write(pfd, "", 1) != 1 || response(pp)) {
sfres = REPRINT;
goto return_sfres;
}
if (type == '\3') {
trstat_write(pp, TR_SENDING, stb.st_size, logname,
pp->remote_host, origin_host);
/*
* Usually we only need to send one copy of a datafile,
* because the control-file will simply print the same
* file multiple times. However, some printers ignore
* the control file, and simply print each data file as
* it arrives. For such "remote hosts", we need to
* transfer the same data file multiple times. Such a
* a host is indicated by adding 'rc' to the printcap
* entry.
* XXX - Right now this ONLY works for remote hosts which
* do ignore the name of the data file, because
* this sends the file multiple times with slight
* changes to the filename. To do this right would
* require that we also rewrite the control file
* to match those filenames.
*/
if (pp->resend_copies && (copycnt < copyreq)) {
lseek(sfd, 0, SEEK_SET);
goto sendagain;
}
}
sfres = OK;
return_sfres:
(void)close(sfd);
if (tfd != -1) {
/*
* If tfd is set, then it is the same value as sfd, and
* therefore it is already closed at this point. All
* we need to do is remove the temporary file.
*/
tfd = -1;
unlink(tfile);
}
return (sfres);
}
/*
* Some print servers send the control-file first, and then start sending the
* matching data file(s). That is not the correct order. If some queue is
* already printing an active job, then when that job is finished the queue
* may proceed to the control file of any incoming print job. This turns
* into a race between the process which is receiving the data file, and the
* process which is actively printing the very same file. When the remote
* server sends files in the wrong order, it is even possible that a queue
* will start to print a data file before the file has been created!
*
* So before we start to print() or send() a data file, we call this routine
* to make sure the data file is not still changing in size. Note that this
* problem will only happen for jobs arriving from a remote host, and that
* the process which has decided to print this job (and is thus making this
* check) is *not* the process which is receiving the job.
*
* A second benefit of this is that any incoming job is guaranteed to appear
* in a queue listing for at least a few seconds after it has arrived. Some
* lpr implementations get confused if they send a job and it disappears
* from the queue before they can check on it.
*/
#define MAXWAIT_ARRIVE 16 /* max to wait for the file to *exist* */
#define MAXWAIT_4DATA (20*60) /* max to wait for it to stop changing */
#define MINWAIT_4DATA 4 /* This value must be >= 1 */
#define DEBUG_MINWAIT 1
static void
wait4data(struct printer *pp, const char *dfile)
{
const char *cp;
int statres;
size_t dlen, hlen;
time_t amtslept, checktime;
struct stat statdf;
/* Skip these checks if the print job is from the local host. */
dlen = strlen(dfile);
hlen = strlen(local_host);
if (dlen > hlen) {
cp = dfile + dlen - hlen;
if (strcmp(cp, local_host) == 0)
return;
}
/*
* If this data file does not exist, then wait up to MAXWAIT_ARRIVE
* seconds for it to arrive.
*/
amtslept = 0;
statres = stat(dfile, &statdf);
while (statres < 0 && amtslept < MAXWAIT_ARRIVE) {
if (amtslept == 0)
pstatus(pp, "Waiting for data file from remote host");
amtslept += MINWAIT_4DATA - sleep(MINWAIT_4DATA);
statres = stat(dfile, &statdf);
}
if (statres < 0) {
/* The file still does not exist, so just give up on it. */
syslog(LOG_WARNING, "%s: wait4data() abandoned wait for %s",
pp->printer, dfile);
return;
}
/*
* The file exists, so keep waiting until the data file has not
* changed for some reasonable amount of time.
*/
while (statres == 0 && amtslept < MAXWAIT_4DATA) {
checktime = time(NULL) - MINWAIT_4DATA;
if (statdf.st_mtime <= checktime)
break;
if (amtslept == 0)
pstatus(pp, "Waiting for data file from remote host");
amtslept += MINWAIT_4DATA - sleep(MINWAIT_4DATA);
statres = stat(dfile, &statdf);
}
if (statres != 0)
syslog(LOG_WARNING, "%s: %s disappeared during wait4data()",
pp->printer, dfile);
else if (amtslept > MAXWAIT_4DATA)
syslog(LOG_WARNING,
"%s: %s still changing after %lu secs in wait4data()",
pp->printer, dfile, (unsigned long)amtslept);
#if DEBUG_MINWAIT
else if (amtslept > MINWAIT_4DATA)
syslog(LOG_INFO, "%s: slept %lu secs in wait4data(%s)",
pp->printer, (unsigned long)amtslept, dfile);
#endif
}
#undef MAXWAIT_ARRIVE
#undef MAXWAIT_4DATA
#undef MINWAIT_4DATA
/*
* This routine is called to execute one of the filters as was
* specified in a printcap entry. While the child-process will read
* all of 'infd', it is up to the caller to close that file descriptor
* in the parent process.
*/
static int
execfilter(struct printer *pp, char *f_cmd, char *f_av[], int infd, int outfd)
{
pid_t fpid, wpid;
int errfd, retcode, wstatus;
FILE *errfp;
char buf[BUFSIZ], *slash;
fpid = dofork(pp, DORETURN);
if (fpid != 0) {
/*
* This is the parent process, which just waits for the child
* to complete and then returns the result. Note that it is
* the child process which reads the input stream.
*/
if (fpid < 0)
retcode = 100;
else {
while ((wpid = wait(&wstatus)) > 0 &&
wpid != fpid)
;
if (wpid < 0) {
retcode = 100;
syslog(LOG_WARNING,
"%s: after execv(%s), wait() returned: %m",
pp->printer, f_cmd);
} else
retcode = WEXITSTATUS(wstatus);
}
/*
* Copy everything the filter wrote to stderr from our
* temporary errors file to the "lf=" logfile.
*/
errfp = fopen(tempstderr, "r");
if (errfp) {
while (fgets(buf, sizeof(buf), errfp))
fputs(buf, stderr);
fclose(errfp);
}
return (retcode);
}
/*
* This is the child process, which is the one that executes the
* given filter.
*/
/*
* If the first parameter has any slashes in it, then change it
* to point to the first character after the last slash.
*/
slash = strrchr(f_av[0], '/');
if (slash != NULL)
f_av[0] = slash + 1;
/*
* XXX - in the future, this should setup an explicit list of
* environment variables and use execve()!
*/
/*
* Setup stdin, stdout, and stderr as we want them when the filter
* is running. Stderr is setup so it points to a temporary errors
* file, and the parent process will copy that temporary file to
* the real logfile after the filter completes.
*/
dup2(infd, STDIN_FILENO);
dup2(outfd, STDOUT_FILENO);
errfd = open(tempstderr, O_WRONLY|O_TRUNC, 0664);
if (errfd >= 0)
dup2(errfd, STDERR_FILENO);
closelog();
closeallfds(3);
execv(f_cmd, f_av);
syslog(LOG_ERR, "%s: cannot execv(%s): %m", pp->printer, f_cmd);
exit(2);
/* NOTREACHED */
}
/*
* Check to make sure there have been no errors and that both programs
* are in sync with eachother.
* Return non-zero if the connection was lost.
*/
static char
response(const struct printer *pp)
{
char resp;
if (read(pfd, &resp, 1) != 1) {
syslog(LOG_INFO, "%s: lost connection", pp->printer);
return (-1);
}
return (resp);
}
/*
* Banner printing stuff
*/
static void
banner(struct printer *pp, char *name1, char *name2)
{
time_t tvec;
time(&tvec);
if (!pp->no_formfeed && !pp->tof)
(void) write(ofd, pp->form_feed, strlen(pp->form_feed));
if (pp->short_banner) { /* short banner only */
if (class[0]) {
(void) write(ofd, class, strlen(class));
(void) write(ofd, ":", 1);
}
(void) write(ofd, name1, strlen(name1));
(void) write(ofd, " Job: ", 7);
(void) write(ofd, name2, strlen(name2));
(void) write(ofd, " Date: ", 8);
(void) write(ofd, ctime(&tvec), 24);
(void) write(ofd, "\n", 1);
} else { /* normal banner */
(void) write(ofd, "\n\n\n", 3);
scan_out(pp, ofd, name1, '\0');
(void) write(ofd, "\n\n", 2);
scan_out(pp, ofd, name2, '\0');
if (class[0]) {
(void) write(ofd,"\n\n\n",3);
scan_out(pp, ofd, class, '\0');
}
(void) write(ofd, "\n\n\n\n\t\t\t\t\tJob: ", 15);
(void) write(ofd, name2, strlen(name2));
(void) write(ofd, "\n\t\t\t\t\tDate: ", 12);
(void) write(ofd, ctime(&tvec), 24);
(void) write(ofd, "\n", 1);
}
if (!pp->no_formfeed)
(void) write(ofd, pp->form_feed, strlen(pp->form_feed));
pp->tof = 1;
}
static char *
scnline(int key, char *p, int c)
{
register int scnwidth;
for (scnwidth = WIDTH; --scnwidth;) {
key <<= 1;
*p++ = key & 0200 ? c : BACKGND;
}
return (p);
}
#define TRC(q) (((q)-' ')&0177)
static void
scan_out(struct printer *pp, int scfd, char *scsp, int dlm)
{
register char *strp;
register int nchrs, j;
char outbuf[LINELEN+1], *sp, c, cc;
int d, scnhgt;
for (scnhgt = 0; scnhgt++ < HEIGHT+DROP; ) {
strp = &outbuf[0];
sp = scsp;
for (nchrs = 0; ; ) {
d = dropit(c = TRC(cc = *sp++));
if ((!d && scnhgt > HEIGHT) || (scnhgt <= DROP && d))
for (j = WIDTH; --j;)
*strp++ = BACKGND;
else
strp = scnline(scnkey[(int)c][scnhgt-1-d], strp, cc);
if (*sp == dlm || *sp == '\0' ||
nchrs++ >= pp->page_width/(WIDTH+1)-1)
break;
*strp++ = BACKGND;
*strp++ = BACKGND;
}
while (*--strp == BACKGND && strp >= outbuf)
;
strp++;
*strp++ = '\n';
(void) write(scfd, outbuf, strp-outbuf);
}
}
static int
dropit(int c)
{
switch(c) {
case TRC('_'):
case TRC(';'):
case TRC(','):
case TRC('g'):
case TRC('j'):
case TRC('p'):
case TRC('q'):
case TRC('y'):
return (DROP);
default:
return (0);
}
}
/*
* sendmail ---
* tell people about job completion
*/
static void
sendmail(struct printer *pp, char *userid, int bombed)
{
register int i;
int p[2], s;
register const char *cp;
struct stat stb;
FILE *fp;
pipe(p);
if ((s = dofork(pp, DORETURN)) == 0) { /* child */
dup2(p[0], STDIN_FILENO);
closelog();
closeallfds(3);
if ((cp = strrchr(_PATH_SENDMAIL, '/')) != NULL)
cp++;
else
cp = _PATH_SENDMAIL;
execl(_PATH_SENDMAIL, cp, "-t", (char *)0);
_exit(0);
} else if (s > 0) { /* parent */
dup2(p[1], STDOUT_FILENO);
printf("To: %s@%s\n", userid, origin_host);
printf("Subject: %s printer job \"%s\"\n", pp->printer,
*jobname ? jobname : "<unknown>");
printf("Reply-To: root@%s\n\n", local_host);
printf("Your printer job ");
if (*jobname)
printf("(%s) ", jobname);
switch (bombed) {
case OK:
cp = "OK";
printf("\ncompleted successfully\n");
break;
default:
case FATALERR:
cp = "FATALERR";
printf("\ncould not be printed\n");
break;
case NOACCT:
cp = "NOACCT";
printf("\ncould not be printed without an account on %s\n",
local_host);
break;
case FILTERERR:
cp = "FILTERERR";
if (stat(tempstderr, &stb) < 0 || stb.st_size == 0
|| (fp = fopen(tempstderr, "r")) == NULL) {
printf("\nhad some errors and may not have printed\n");
break;
}
printf("\nhad the following errors and may not have printed:\n");
while ((i = getc(fp)) != EOF)
putchar(i);
(void) fclose(fp);
break;
case ACCESS:
cp = "ACCESS";
printf("\nwas not printed because it was not linked to the original file\n");
}
fflush(stdout);
(void) close(STDOUT_FILENO);
} else {
syslog(LOG_WARNING, "unable to send mail to %s: %m", userid);
return;
}
(void) close(p[0]);
(void) close(p[1]);
wait(NULL);
syslog(LOG_INFO, "mail sent to user %s about job %s on printer %s (%s)",
userid, *jobname ? jobname : "<unknown>", pp->printer, cp);
}
/*
* dofork - fork with retries on failure
*/
static int
dofork(const struct printer *pp, int action)
{
pid_t forkpid;
int i, fail;
struct passwd *pwd;
forkpid = -1;
if (daemon_uname == NULL) {
pwd = getpwuid(pp->daemon_user);
if (pwd == NULL) {
syslog(LOG_ERR, "%s: Can't lookup default daemon uid (%ld) in password file",
pp->printer, pp->daemon_user);
goto error_ret;
}
daemon_uname = strdup(pwd->pw_name);
daemon_defgid = pwd->pw_gid;
}
for (i = 0; i < 20; i++) {
forkpid = fork();
if (forkpid < 0) {
sleep((unsigned)(i*i));
continue;
}
/*
* Child should run as daemon instead of root
*/
if (forkpid == 0) {
errno = 0;
fail = initgroups(daemon_uname, daemon_defgid);
if (fail) {
syslog(LOG_ERR, "%s: initgroups(%s,%u): %m",
pp->printer, daemon_uname, daemon_defgid);
break;
}
fail = setgid(daemon_defgid);
if (fail) {
syslog(LOG_ERR, "%s: setgid(%u): %m",
pp->printer, daemon_defgid);
break;
}
fail = setuid(pp->daemon_user);
if (fail) {
syslog(LOG_ERR, "%s: setuid(%ld): %m",
pp->printer, pp->daemon_user);
break;
}
}
return (forkpid);
}
/*
* An error occurred. If the error is in the child process, then
* this routine MUST always exit(). DORETURN only effects how
* errors should be handled in the parent process.
*/
error_ret:
if (forkpid == 0) {
syslog(LOG_ERR, "%s: dofork(): aborting child process...",
pp->printer);
exit(1);
}
syslog(LOG_ERR, "%s: dofork(): failure in fork", pp->printer);
sleep(1); /* throttle errors, as a safety measure */
switch (action) {
case DORETURN:
return (-1);
default:
syslog(LOG_ERR, "bad action (%d) to dofork", action);
/* FALLTHROUGH */
case DOABORT:
exit(1);
}
/*NOTREACHED*/
}
/*
* Kill child processes to abort current job.
*/
static void
abortpr(int signo __unused)
{
(void) unlink(tempstderr);
kill(0, SIGINT);
if (of_pid > 0)
kill(of_pid, SIGCONT);
while (wait(NULL) > 0)
;
if (of_pid > 0 && tfd != -1)
unlink(tfile);
exit(0);
}
static void
init(struct printer *pp)
{
char *s;
sprintf(&width[2], "%ld", pp->page_width);
sprintf(&length[2], "%ld", pp->page_length);
sprintf(&pxwidth[2], "%ld", pp->page_pwidth);
sprintf(&pxlength[2], "%ld", pp->page_plength);
if ((s = checkremote(pp)) != 0) {
syslog(LOG_WARNING, "%s", s);
free(s);
}
}
void
startprinting(const char *printer)
{
struct printer myprinter, *pp = &myprinter;
int status;
init_printer(pp);
status = getprintcap(printer, pp);
switch(status) {
case PCAPERR_OSERR:
syslog(LOG_ERR, "can't open printer description file: %m");
exit(1);
case PCAPERR_NOTFOUND:
syslog(LOG_ERR, "unknown printer: %s", printer);
exit(1);
case PCAPERR_TCLOOP:
fatal(pp, "potential reference loop detected in printcap file");
default:
break;
}
printjob(pp);
}
/*
* Acquire line printer or remote connection.
*/
static void
openpr(const struct printer *pp)
{
int p[2];
char *cp;
if (pp->remote) {
openrem(pp);
/*
* Lpd does support the setting of 'of=' filters for
* jobs going to remote machines, but that does not
* have the same meaning as 'of=' does when handling
* local print queues. For remote machines, all 'of='
* filter processing is handled in sendfile(), and that
* does not use these global "output filter" variables.
*/
ofd = -1;
of_pid = 0;
return;
} else if (*pp->lp) {
if ((cp = strchr(pp->lp, '@')) != NULL)
opennet(pp);
else
opentty(pp);
} else {
syslog(LOG_ERR, "%s: no line printer device or host name",
pp->printer);
exit(1);
}
/*
* Start up an output filter, if needed.
*/
if (pp->filters[LPF_OUTPUT] && !pp->filters[LPF_INPUT] && !of_pid) {
pipe(p);
if (pp->remote) {
strcpy(tfile, TFILENAME);
tfd = mkstemp(tfile);
}
if ((of_pid = dofork(pp, DOABORT)) == 0) { /* child */
dup2(p[0], STDIN_FILENO); /* pipe is std in */
/* tfile/printer is stdout */
dup2(pp->remote ? tfd : pfd, STDOUT_FILENO);
closelog();
closeallfds(3);
if ((cp = strrchr(pp->filters[LPF_OUTPUT], '/')) == NULL)
cp = pp->filters[LPF_OUTPUT];
else
cp++;
execl(pp->filters[LPF_OUTPUT], cp, width, length,
(char *)0);
syslog(LOG_ERR, "%s: execl(%s): %m", pp->printer,
pp->filters[LPF_OUTPUT]);
exit(1);
}
(void) close(p[0]); /* close input side */
ofd = p[1]; /* use pipe for output */
} else {
ofd = pfd;
of_pid = 0;
}
}
/*
* Printer connected directly to the network
* or to a terminal server on the net
*/
static void
opennet(const struct printer *pp)
{
register int i;
int resp;
u_long port;
char *ep;
void (*savealrm)(int);
port = strtoul(pp->lp, &ep, 0);
if (*ep != '@' || port > 65535) {
syslog(LOG_ERR, "%s: bad port number: %s", pp->printer,
pp->lp);
exit(1);
}
ep++;
for (i = 1; ; i = i < 256 ? i << 1 : i) {
resp = -1;
savealrm = signal(SIGALRM, alarmhandler);
alarm(pp->conn_timeout);
pfd = getport(pp, ep, port);
alarm(0);
(void)signal(SIGALRM, savealrm);
if (pfd < 0 && errno == ECONNREFUSED)
resp = 1;
else if (pfd >= 0) {
/*
* need to delay a bit for rs232 lines
* to stabilize in case printer is
* connected via a terminal server
*/
delay(500);
break;
}
if (i == 1) {
if (resp < 0)
pstatus(pp, "waiting for %s to come up",
pp->lp);
else
pstatus(pp,
"waiting for access to printer on %s",
pp->lp);
}
sleep(i);
}
pstatus(pp, "sending to %s port %lu", ep, port);
}
/*
* Printer is connected to an RS232 port on this host
*/
static void
opentty(const struct printer *pp)
{
register int i;
for (i = 1; ; i = i < 32 ? i << 1 : i) {
pfd = open(pp->lp, pp->rw ? O_RDWR : O_WRONLY);
if (pfd >= 0) {
delay(500);
break;
}
if (errno == ENOENT) {
syslog(LOG_ERR, "%s: %m", pp->lp);
exit(1);
}
if (i == 1)
pstatus(pp,
"waiting for %s to become ready (offline?)",
pp->printer);
sleep(i);
}
if (isatty(pfd))
setty(pp);
pstatus(pp, "%s is ready and printing", pp->printer);
}
/*
* Printer is on a remote host
*/
static void
openrem(const struct printer *pp)
{
register int i;
int resp;
void (*savealrm)(int);
for (i = 1; ; i = i < 256 ? i << 1 : i) {
resp = -1;
savealrm = signal(SIGALRM, alarmhandler);
alarm(pp->conn_timeout);
pfd = getport(pp, pp->remote_host, 0);
alarm(0);
(void)signal(SIGALRM, savealrm);
if (pfd >= 0) {
if ((writel(pfd, "\2", pp->remote_queue, "\n",
(char *)0)
== 2 + strlen(pp->remote_queue))
&& (resp = response(pp)) == 0)
break;
(void) close(pfd);
}
if (i == 1) {
if (resp < 0)
pstatus(pp, "waiting for %s to come up",
pp->remote_host);
else {
pstatus(pp,
"waiting for queue to be enabled on %s",
pp->remote_host);
i = 256;
}
}
sleep(i);
}
pstatus(pp, "sending to %s", pp->remote_host);
}
/*
* setup tty lines.
*/
static void
setty(const struct printer *pp)
{
struct termios ttybuf;
if (ioctl(pfd, TIOCEXCL, (char *)0) < 0) {
syslog(LOG_ERR, "%s: ioctl(TIOCEXCL): %m", pp->printer);
exit(1);
}
if (tcgetattr(pfd, &ttybuf) < 0) {
syslog(LOG_ERR, "%s: tcgetattr: %m", pp->printer);
exit(1);
}
if (pp->baud_rate > 0)
cfsetspeed(&ttybuf, pp->baud_rate);
if (pp->mode_set) {
char *s = strdup(pp->mode_set), *tmp;
while ((tmp = strsep(&s, ",")) != NULL) {
(void) msearch(tmp, &ttybuf);
}
}
if (pp->mode_set != 0 || pp->baud_rate > 0) {
if (tcsetattr(pfd, TCSAFLUSH, &ttybuf) == -1) {
syslog(LOG_ERR, "%s: tcsetattr: %m", pp->printer);
}
}
}
#include <stdarg.h>
static void
pstatus(const struct printer *pp, const char *msg, ...)
{
int fd;
char *buf;
va_list ap;
va_start(ap, msg);
umask(S_IWOTH);
fd = open(pp->status_file, O_WRONLY|O_CREAT|O_EXLOCK, STAT_FILE_MODE);
if (fd < 0) {
syslog(LOG_ERR, "%s: open(%s): %m", pp->printer,
pp->status_file);
exit(1);
}
ftruncate(fd, 0);
vasprintf(&buf, msg, ap);
va_end(ap);
writel(fd, buf, "\n", (char *)0);
close(fd);
free(buf);
}
void
alarmhandler(int signo __unused)
{
/* the signal is ignored */
/* (the '__unused' is just to avoid a compile-time warning) */
}
Reference in New Issue View Git Blame Copy Permalink